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diff --git a/doc/src/sgml/release-9.4.sgml b/doc/src/sgml/release-9.4.sgml new file mode 100644 index 00000000000..616561e4e72 --- /dev/null +++ b/doc/src/sgml/release-9.4.sgml @@ -0,0 +1,1898 @@ +<!-- doc/src/sgml/release-9.4.sgml --> +<!-- See header comment in release.sgml about typical markup --> + + <sect1 id="release-9-4"> + <title>Release 9.4</title> + + <note> + <title>Release Date</title> + <simpara>2014-??-??</simpara> + <simpara>Current as of 2014-05-03</simpara> + </note> + + <sect2> + <title>Overview</title> + + <para> + Major enhancements in <productname>PostgreSQL</> 9.4 include: + </para> + + <!-- This list duplicates items below, but without authors or details--> + + <itemizedlist> + + <listitem> + <para> + </para> + </listitem> + + </itemizedlist> + + <para> + The above items are explained in more detail in the sections below. + </para> + + </sect2> + + <sect2> + + <title>Migration to Version 9.4</title> + + <para> + A dump/restore using <link + linkend="APP-PG-DUMPALL"><application>pg_dumpall</></link>, or use + of <link linkend="pgupgrade"><application>pg_upgrade</></link>, is + required for those wishing to migrate data from any previous release. + </para> + + <para> + Version 9.4 contains a number of changes that may affect compatibility + with previous releases. Observe the following incompatibilities: + </para> + + <itemizedlist> + + <listitem> + <para> + Cause consecutive whitespace in to_timestamp() and to_date() format strings to consume a corresponding number of characters in the input + string (whitespace or not), then conditionally additional adjacent whitespace if not in FX mode (Jeevan Chalke) + </para> + + <para> + Previously consecutive whitespace characters in a non-FX format string behaved like a single whitespace character and consumed all + adjacent whitespace in the input string. For example, previously format string space-space-space would consume only the first space in ' 12', while it will not consume all three characters. + </para> + </listitem> + + <listitem> + <para> + Tighten checks for multi-dimensional array input (Bruce Momjian) + </para> + + <para> + Previously an input array string that started with a single-element array dimension could later contain multi-dimensional + segments. + </para> + </listitem> + + <listitem> + <para> + Change empty arrays returned by intarray to be zero-dimensional arrays (Bruce Momjian) + </para> + + <para> + Previously empty arrays were returned as one-dimensional empty arrays whose text representation looks the same as + zero-dimensional arrays. intarray's behavior in this area now matches the built-in array operators. + </para> + </listitem> + + <listitem> + <para> + NULL VARIADIC function arguments are now disallowed (Pavel Stehule) + </para> + + <para> + NULL VARIADIC arguments must be cast to an array data type. + </para> + </listitem> + + <listitem> + <para> + SHOW TIME ZONE now outputs constant time zone offsets in POSIX-style zone format (Tom Lane) + </para> + + <para> + Previously it was returned in INTERVAL format. The new format can be passed to SET TIME ZONE. + </para> + </listitem> + + <listitem> + <para> + Rename EXPLAIN ANALYZE's "total runtime" output to "execution time" (Tom Lane) + </para> + + <para> + This was required now that planning time is also reported. + </para> + </listitem> + + <listitem> + <para> + Fix ts_rank_cd() to ignore stripped lexemes (Alex Hill) + </para> + + <para> + Previously, stripped lexemes got a default location and could be considered if mixed with non-stripped lexemes. + </para> + </listitem> + + <listitem> + <para> + Prevent CHECK constraints from referencing system columns, except tableoid (Amit Kapila) + </para> + + <para> + Restoring such check constraints will lead to restore errors. + </para> + </listitem> + + <listitem> + <para> + Remove system column pg_class.reltoastidxid (Michael Paquier) + </para> + + <para> + Instead use normal index access methods. + </para> + </listitem> + + <listitem> + <para> + Remove support for native krb5 authentication (Magnus Hagander) + </para> + + <para> + The proper way to use Kerberos authentication is with GSSAPI. + </para> + </listitem> + + <listitem> + <para> + Have libpq's PQconnectdbParams() and PQpingParams functions accept "" as default (Adrian Vondendriesch) + </para> + + <para> + Previously, these functions treated "" option values as defaults only in some cases. + </para> + </listitem> + + <listitem> + <para> + Remove system column pg_rewrite.ev_attr (Kevin Grittner) + </para> + + <para> + Per-column rules have not been supported since 7.3. + </para> + </listitem> + + <listitem> + <para> + Pg_upgrade now uses -U to specify the user name (Bruce Momjian) + </para> + + <para> + Previously, -u was used to specify the user name. Also spell the long option as --username, again for consistency with other + tools. + </para> + </listitem> + + </itemizedlist> + + </sect2> + + <sect2> + <title>Changes</title> + + <para> + Below you will find a detailed account of the changes between + <productname>PostgreSQL</productname> 9.4 and the previous major + release. + </para> + + <sect3> + <title>Server</title> + + <itemizedlist> + + <listitem> + <para> + Have VACUUM properly report dead but not removable rows to the statistics collector (Hari Babu) + </para> + + <para> + Previously these were reported as live rows. + </para> + </listitem> + + <listitem> + <para> + Improve SSL renegotiation handling (Álvaro Herrera) + </para> + </listitem> + + <listitem> + <para> + During immediate shutdown, send uncatchable termination signals to child processes that have not already shutdown (MauMau, + Álvaro Herrera) + </para> + + <para> + This reduces the likelihood of orphaned child processes after postmaster shutdown. + </para> + </listitem> + + <listitem> + <para> + Improve randomness of the database system identifier (Tom Lane) + </para> + </listitem> + + <listitem> + <para> + Allow background workers to be dynamically started and terminated (Robert Haas) + </para> + + <para> + worker_spi_launch() in worker_spi shows an example if its use. + </para> + </listitem> + + <listitem> + <para> + Allow dynamic allocation of shared memory segments (Robert Haas, Amit Kapila) + </para> + </listitem> + + </itemizedlist> + + <sect4> + <title>Indexes</title> + + <itemizedlist> + + <listitem> + <para> + Improve speed of multi-key GIN lookups (Alexander Korotkov, Heikki Linnakangas) + </para> + </listitem> + + <listitem> + <para> + Reduce GIN index size (Alexander Korotkov, Heikki Linnakangas) + </para> + + <para> + Indexes upgraded via pg_upgrade will work fine but will use the old larger GIN format; REINDEX will recreate the index in the new + format. + </para> + </listitem> + + <listitem> + <para> + Add GiST index support for INET and CIDR data types (Emre Hasegeli) + </para> + + <para> + Such indexes improve subnet and supernet lookups and ordering comparisons. + </para> + </listitem> + + </itemizedlist> + + </sect4> + + <sect4> + <title>General Performance</title> + + <itemizedlist> + + <listitem> + <para> + Allow multiple backends to simultaneously insert into WAL buffers (Heikki Linnakangas) + </para> + + <para> + This improves parallel write performance. + </para> + </listitem> + + <listitem> + <para> + Conditionally write only the modified portion of updated rows to WAL (Amit Kapila) + </para> + </listitem> + + <listitem> + <para> + Improve performance of WINDOW aggregate functions (David Rowley, Florian Pflug, Tom Lane) + </para> + </listitem> + + <listitem> + <para> + Improve speed of aggregates which use NUMERICs (Hadi Moshayedi) + </para> + + <para> + These include sum(), avg(), stddev(), and variance(). + </para> + </listitem> + + <listitem> + <para> + Freeze tuples when tables are written with CLUSTER or VACUUM FULL (Robert Haas, Andres Freund) + </para> + + <para> + This avoids later freezing overhead. + </para> + </listitem> + + <listitem> + <para> + Improve speed of COPY with DEFAULT nextval() columns (Simon Riggs) + </para> + </listitem> + + <listitem> + <para> + Improve speed of accessing many sequence values (David Rowley) + </para> + </listitem> + + <listitem> + <para> + Allow sorting and btree index builds to use over four gigabytes of memory (Noah Misch) + </para> + </listitem> + + <listitem> + <para> + Reduce memory allocated by DO blocks (Tom Lane) + </para> + </listitem> + + <listitem> + <para> + Have the optimizer be more aggressive in creating restrictions from mixed AND/OR clauses (Tom Lane) + </para> + </listitem> + + <listitem> + <para> + Use memory barriers to avoid some spinlock use (Heikki Linnakangas) + </para> + </listitem> + + </itemizedlist> + + </sect4> + + <sect4> + <title>Monitoring</title> + + <itemizedlist> + + <listitem> + <para> + Expose the estimation of number of changed tuples since last analyze (Mark Kirkwood) + </para> + + <para> + This appears in pg_stat_all_tables.n_mod_since_analyze. + </para> + </listitem> + + <listitem> + <para> + Add pg_stat_archiver system view to report WAL archiver activity (Gabriele Bartolini) + </para> + </listitem> + + <listitem> + <para> + Add xid and xmin to system views pg_stat_activity and pg_stat_replication (Christian Kruse) + </para> + </listitem> + + </itemizedlist> + + </sect4> + + <sect4> + <title>SSL</title> + + <itemizedlist> + + <listitem> + <para> + Add support for SSL ECDH key exchange (Marko Kreen) + </para> + + <para> + Such keys are faster and have improved security over previous options. New variable ssl_ecdh_curve controls the curve that is + used. + </para> + </listitem> + + <listitem> + <para> + Improve the default ssl_ciphers ciphers (Marko Kreen) + </para> + </listitem> + + <listitem> + <para> + Allow the server to specify the preferred SSL cipher order (Marko Kreen) + </para> + + <para> + This is controlled by the new configuration parameter ssl_prefer_server_ciphers. + </para> + </listitem> + + <listitem> + <para> + Have log_connections show SSL encryption information (Andreas Kunert) + </para> + </listitem> + + </itemizedlist> + + </sect4> + + <sect4> + <title>Server Settings</title> + + <itemizedlist> + + <listitem> + <para> + Add SQL-level command ALTER SYSTEM command to edit the postgresql.conf configuration file (Amit Kapila) + </para> + + <para> + Previously postgresql.conf could only be edited at the file system level. + </para> + </listitem> + + <listitem> + <para> + Add huge_pages configuration parameter to attempt to use huge translation look-aside buffer (TLB) pages on Linux (Christian Kruse, + Richard Poole, Abhijit Menon-Sen) + </para> + + <para> + This can improve performance on large memory systems. + </para> + </listitem> + + <listitem> + <para> + Show PIDs of lock holders and waiters and improve relation + information in log_lock_waits log messages (Christian Kruse) + </para> + </listitem> + + <listitem> + <para> + Add parameter autovacuum_work_mem to control the amount of memory used by autovacuum workers (Peter Geoghegan) + </para> + </listitem> + + <listitem> + <para> + Add max_worker_processes to limit the number of background workers (Robert Haas) + </para> + + <para> + This is helpful in configuring the standby server to have the required same number of worker processes as the primary. + </para> + </listitem> + + <listitem> + <para> + Add configuration parameter wal_log_hints to enable logging of hint bits (Sawada Masahiko) + </para> + + <para> + Hint bits are not normally logged, except when checksums are enabled. This is useful for tools like pg_rewind. + </para> + </listitem> + + <listitem> + <para> + Allow printf-style space padding to be specified in log_line_prefix (David Rowley) + </para> + </listitem> + + <listitem> + <para> + Add configuration variable data_checksums to report whether data page checksums are enabled (Bernd Helmle) + </para> + </listitem> + + <listitem> + <para> + Add superuser-only session_preload_libraries configuration parameter to load libraries at session start (Peter Eisentraut) + </para> + + <para> + Such libraries are auto-LOAD'ed, unlike local_preload_libraries. + </para> + </listitem> + + <listitem> + <para> + Reduce server logging level when loading shared libraries (Peter Geoghegan) + </para> + + <para> + The previous level was LOG, which was too verbose for per-session libraries. + </para> + </listitem> + + <listitem> + <para> + Auto-tune effective_cache size to be four-times shared buffers (Bruce Momjian, Tom Lane) + </para> + </listitem> + + <listitem> + <para> + Increase work_mem and maintenance_work_mem defaults by four-times (Bruce Momjian) + </para> + + <para> + The new defaults are 4MB and 64MB respectively. + </para> + </listitem> + + <listitem> + <para> + Allow terabyte units to be specified for configuration variable values (Simon Riggs) + </para> + </listitem> + + <listitem> + <para> + Have Windows ASCII-encoded databases and server process (e.g. postmaster) emit messages in the LC_CTYPE-defined language (Alexander Law, + Noah Misch) + </para> + + <para> + Previously these messages were output using the Windows ANSI code page. + </para> + </listitem> + + </itemizedlist> + + </sect4> + + </sect3> + + <sect3> + <title>Replication and Recovery</title> + + <itemizedlist> + + <listitem> + <para> + Allow recovery.conf parameter min_recovery_apply_delay to force delayed replication (Robert Haas, Fabrízio de Royes Mello, Simon Riggs) + </para> + + <para> + This is useful for delaying replaying of user errors on standby servers. + </para> + </listitem> + + <listitem> + <para> + Add recovery_target='immediate' option to replay WAL stop recovery when a consistent state is reached, i.e. pg_stop_backup() (MauMau, + Heikki Linnakangas) + </para> + </listitem> + + <listitem> + <para> + Improve recovery target processing (Heikki Linnakangas) + </para> + + <para> + The timestamp reported by pg_last_xact_replay_timestamp() now shows information about committed records, not commits being + replayed. Recovering to restore points now replay the restore point, rather than stop just before the restore point. + </para> + </listitem> + + <listitem> + <para> + Use the last specified recovery_target if multiple are specified (Heikki Linnakangas) + </para> + </listitem> + + <listitem> + <para> + pg_switch_xlog() now clears the trailing unused space in the WAL file (Heikki Linnakangas) + </para> + + <para> + This improves the compression ratio for WAL files. + </para> + </listitem> + + <listitem> + <para> + Add replication slots to report the WAL activity on streaming standbys (Andres Freund, Robert Haas) + </para> + + <para> + Description? Logical only? + </para> + </listitem> + + <listitem> + <para> + Improve return codes from external recovery commands (Peter Eisentraut) + </para> + </listitem> + + <listitem> + <para> + Write WAL records of running transactions every 15 seconds ? (Andres Freund) + </para> + </listitem> + + </itemizedlist> + + <sect4> + <title>Logical Change-Set Encoding</title> + + <itemizedlist> + + <listitem> + <para> + Add new "logical" wal_level to enable logical change-set encoding in WAL (Andres Freund) + </para> + + <para> + This interacts with REPLICA IDENTITY. + </para> + </listitem> + + <listitem> + <para> + Add tool pg_recvlogical to receive data logical decoding data (Andres Freund) + </para> + </listitem> + + <listitem> + <para> + Add contrib/test_decoding module to illustrate logical decoding at the SQL level (Andres Freund) + </para> + </listitem> + + <listitem> + <para> + Allow logical decoding via the walsender interface ? (Andres Freund) + </para> + </listitem> + + <listitem> + <para> + Add table-level parameter REPLICA IDENTITY to control logical replication (Andres Freund) + </para> + </listitem> + + <listitem> + <para> + Add relation option user_catalog_table to identify user-created tables involved in logical change-set encoding (Andres Freund) + </para> + </listitem> + + </itemizedlist> + + </sect4> + + </sect3> + + <sect3> + <title>Queries</title> + + <itemizedlist> + + <listitem> + <para> + Add ROWS FROM syntax to allow horizontal concatenation of FROM-clause set-returning functions (Andrew Gierth) + </para> + </listitem> + + <listitem> + <para> + Add WITH ORDINALITY which numbers rows returned from FROM-clause functions (Andrew Gierth, David Fetter) + </para> + + <para> + This is particularly useful for functions like UNNEST. + </para> + </listitem> + + <listitem> + <para> + Allow SELECT with an empty target list (Tom Lane) + </para> + + <para> + This was added for consistency, and so querying tables with no columns would not produce an error. + </para> + </listitem> + + </itemizedlist> + + </sect3> + + <sect3> + <title>Utility Commands</title> + + <itemizedlist> + + <listitem> + <para> + Add DISCARD SEQUENCES command to discard cached sequence information (Fabrízio de Royes Mello, Robert Haas) + </para> + + <para> + DISCARD ALL will now also discard such information. + </para> + </listitem> + + <listitem> + <para> + Allow quoted strings matching the null string to be converted + to NULL in COPY FROM CVS mode (Ian Barwick, Michael Paquier) + </para> + + <para> + Previously only unquoted matching strings would be imported as + NULLs. + </para> + </listitem> + + <listitem> + <para> + Issue warnings for SET outside of a transaction block, as they have no effect (Bruce Momjian) + </para> + + <para> + The cases are SET LOCAL/CONSTRAINTS/TRANSACTION and ABORT. + </para> + </listitem> + + </itemizedlist> + + <sect4> + <title>EXPLAIN</title> + + <itemizedlist> + + <listitem> + <para> + Have EXPLAIN ANALYZE output planning time (Andreas Karlsson) + </para> + </listitem> + + <listitem> + <para> + Have EXPLAIN print the grouping columns in Agg and Group nodes (Tom Lane) + </para> + </listitem> + + <listitem> + <para> + Have EXPLAIN ANALYZE show bitmap heap scan exact/lossy block information (Etsuro Fujita) + </para> + </listitem> + + </itemizedlist> + + </sect4> + + <sect4> + <title>Views</title> + + <itemizedlist> + + <listitem> + <para> + Allow materialized views to be refreshed without blocking reads (Kevin Grittner) + </para> + + <para> + This is done with REFRESH MATERIALIZED VIEW CONCURRENTLY. + </para> + </listitem> + + <listitem> + <para> + Allow auto-updates on views where only some columns are auto-updateable (Dean Rasheed) + </para> + + <para> + Previously the presence of a non-auto-updateable column prevented all columns from being auto-updated. Deletes are now supported + on suitable views even if no auto-updateable columns are present. + </para> + </listitem> + + <listitem> + <para> + Allow control over whether INSERTs and UPDATEs can add rows to an auto-updateable view that would no longer appear in the view (Dean Rasheed) + </para> + + <para> + This is controlled with the new WITH CHECK OPTION. + </para> + </listitem> + + <listitem> + <para> + Allow security barrier views automatically updateable (Dean Rasheed) + </para> + </listitem> + + </itemizedlist> + + </sect4> + + </sect3> + + <sect3> + <title>Object Manipulation</title> + + <itemizedlist> + + <listitem> + <para> + Allow triggers on foreign tables (Ronan Dunklau) + </para> + </listitem> + + <listitem> + <para> + Fix DROP IF EXISTS to more consistently not error for non-existent objects (Pavel Stehule, Dean Rasheed) + </para> + </listitem> + + <listitem> + <para> + Improve the internal definition of system relations (Andres Freund, Robert Haas) + </para> + + <para> + Previously, relations moved into the system catalog schema could not be modified. + </para> + </listitem> + + <listitem> + <para> + Allow ALTER TABLESPACE options to be also set by CREATE TABLESPACE (Vik Fearing) + </para> + </listitem> + + <listitem> + <para> + Allow CREATE AGGREGATE to supply the size of the aggregate's transition state data (Hadi Moshayedi) + </para> + </listitem> + + </itemizedlist> + + <sect4> + <title><command>ALTER</></title> + + <itemizedlist> + + <listitem> + <para> + Allow moving groups of objects from one tablespace to another using ALTER TABLESPACE ... MOVE (Stephen Frost) + </para> + </listitem> + + <listitem> + <para> + Allow the changing of foreign key constraint via ALTER TABLE ... ALTER CONSTRAINT (Simon Riggs) + </para> + </listitem> + + <listitem> + <para> + Reduce lock levels of some ALTER TABLE commands (Simon Riggs, Noah Misch) + </para> + + <para> + Specifically, VALIDATE CONSTRAINT, CLUSTER ON, SET WITHOUT CLUSTER, ALTER COLUMN SET STATISTICS, ALTER COLUMN + SET(attribute_option), ALTER COLUMN RESET(attribute_option). + </para> + </listitem> + + </itemizedlist> + + </sect4> + + </sect3> + + <sect3> + <title>Data Types</title> + + <itemizedlist> + + <listitem> + <para> + Fully-implement the line data type (Peter Eisentraut) + </para> + + <para> + The line segment data type (LSEG) has always been supported. + </para> + </listitem> + + <listitem> + <para> + Add PG_LSN data type to represent a WAL log sequence number (LSN) (Robert Haas, Michael Paquier) + </para> + </listitem> + + <listitem> + <para> + Allow single-point POLYGONs to be converted to circles (Bruce Momjian) + </para> + </listitem> + + <listitem> + <para> + Allow 5+ digit years for non-ISO timestamp/date strings, where appropriate (Bruce Momjian) + </para> + </listitem> + + <listitem> + <para> + Add checks for overflow/underflow of INTERVAL values (Bruce Momjian) + </para> + </listitem> + + </itemizedlist> + + <sect4> + <title><link linkend="datatype-json"><type>JSON</></link></title> + + <itemizedlist> + + <listitem> + <para> + Add structured (non-text) data type (jsonb) for storing JSON data (Oleg Bartunov, Teodor Sigaev, Peter Geoghegan and Andrew Dunstan) + </para> + + <para> + This data type allows faster indexing and access to json keys/value pairs. + </para> + </listitem> + + <listitem> + <para> + Add new JSON functions to allow for the construction of arbitrarily complex json trees (Andrew Dunstan, Laurence Rowe) + </para> + + <para> + New functions include json_array_elements_text(), json_build_array(), json_object(), json_object_agg(), json_to_record(), + json_to_recordset(). + </para> + </listitem> + + <listitem> + <para> + Add json_typeof() to return the data type of a JSON value (Andrew Tipton) + </para> + </listitem> + + </itemizedlist> + + </sect4> + + </sect3> + + + <sect3> + <title>Functions</title> + + <itemizedlist> + + <listitem> + <para> + Add pg_sleep_for(interval) and pg_sleep_until(timestamp) to specify sophisticated delays (Vik Fearing, Julien Rouhaud) + </para> + + <para> + pg_sleep() only supports delays specified in seconds. + </para> + </listitem> + + <listitem> + <para> + Add cardinality() function for arrays (Marko Tiikkaja) + </para> + + <para> + This returns the total number of elements in the array, or zero for an array with no elements. + </para> + </listitem> + + <listitem> + <para> + Add SQL functions to allow large object reads/writes at arbitrary offsets (Pavel Stehule) + </para> + </listitem> + + <listitem> + <para> + Allow UNNEST() to take multiple arguments, which are individually unnested then horizontally concatenated (Andrew Gierth) + </para> + </listitem> + + <listitem> + <para> + Add functions to construct times, dates, timestamps, timestamptzs, and intervals from individual values, rather than strings (Pavel Stehule) + </para> + + <para> + The functions being with "make_", e.g. make_date. + </para> + </listitem> + + <listitem> + <para> + Have to_char(TZ) return the proper value for constant time zone offsets (Tom Lane) + </para> + + <para> + Previously, to_char(CURRENT_TIMESTAMP, 'TZ') returned NULL if the TIME ZONE was set to a constant like '-4'. + </para> + </listitem> + + <listitem> + <para> + Add timezone offset output option 'OF' to to_char() (Bruce Momjian) + </para> + </listitem> + + <listitem> + <para> + Improve the random seed used for random() (Honza Horak) + </para> + </listitem> + + </itemizedlist> + + <sect4> + <title>System Information Functions</title> + + <itemizedlist> + + <listitem> + <para> + Add functions for error-free pg_class, pg_proc, pg_type, and pg_operator lookups (Yugo Nagata, Nozomi Anzai, Robert Haas) + </para> + + <para> + For example, to_regclass() does error-free lookups of pg_class, and returns NULL for lookup failures. + </para> + </listitem> + + <listitem> + <para> + Add functions pg_filenode_relation() and pg_relation_filepath() to do relation/relfilenode conversions (Andres Freund) + </para> + + <para> + These use a new pg_class index to speed lookups. + </para> + </listitem> + + <listitem> + <para> + Add information_schema column parameters.parameter_default (Peter Eisentraut) + </para> + </listitem> + + <listitem> + <para> + Have information_schema.schemata show all accessible schema (Peter Eisentraut) + </para> + + <para> + Previously it only showed _owned_ schemas. + </para> + </listitem> + + </itemizedlist> + + </sect4> + + <sect4> + <title>Aggregates</title> + + <itemizedlist> + + <listitem> + <para> + Add aggregates percentile_cont(), percentile_disc(), rank(), dense_rank(), percent_rank(), cume_dist(), and mode() (Atri Sharma, Andrew + Gierth) + </para> + </listitem> + + <listitem> + <para> + Add control over which values are passed into + aggregate functions using the FILTER clause (David Fetter) + </para> + </listitem> + + <listitem> + <para> + Support ordered-set (WITHIN GROUP) aggregates (Atri Sharma, Andrew Gierth, Tom Lane) + </para> + + <para> + This allows aggregates that require sorted input. + </para> + </listitem> + + <listitem> + <para> + Allow polymorphic aggregates to have non-polymorphic state data types ? (Tom Lane) + </para> + </listitem> + + <listitem> + <para> + Allow VARIADIC aggregate functions (Tom Lane) + </para> + </listitem> + + </itemizedlist> + + </sect4> + + </sect3> + + <sect3> + <title>Server-Side Languages</title> + + <sect4> + <title><link linkend="plpgsql">PL/pgSQL</link> Server-Side Language</title> + + <itemizedlist> + + <listitem> + <para> + Add event trigger support to PL/Perl and PL/Tcl (Dimitri Fontaine) + </para> + </listitem> + + </itemizedlist> + + <itemizedlist> + + <listitem> + <para> + Add ability to store the PL/PgSQL call stack into a variable using PG_CONTEXT (Pavel Stehule, Stephen Frost) + </para> + </listitem> + + <listitem> + <para> + Add option print_strict_params to output parameters passed to + queries generating STRICT errors (Marko Tiikkaja) + </para> + </listitem> + + <listitem> + <para> + Add option to enable additional PL/pgSQL errors and warnings (Marko Tiikkaja, Petr Jelinek) + </para> + + <para> + Currently only shadowed variable errors/warnings are available. + </para> + </listitem> + + </itemizedlist> + + </sect4> + + <sect4> + <title><link linkend="plpython">PL/Python</link> Server-Side Language</title> + + <itemizedlist> + + <listitem> + <para> + Handle domains over arrays like plain arrays in PL/python (Rodolfo Campero) + </para> + + <para> + Previously they were treated as strings. + </para> + </listitem> + + <listitem> + <para> + Convert NUMERICs to "decimal" values in PL/Python (Szymon Guz, Ronan Dunklau) + </para> + + <para> + Previously these were converted to "floats". + </para> + </listitem> + + </itemizedlist> + + </sect4> + + </sect3> + + <sect3> + <title><link linkend="libpq"><application>libpq</></link></title> + <itemizedlist> + + <listitem> + <para> + Add libpq function PQhostaddr() to return the server's IP address (Fujii Masao) + </para> + </listitem> + + <listitem> + <para> + Make libpq's PQconndefaults() ignore invalid service files (Steve Singer, Bruce Momjian) + </para> + + <para> + Previously it returned NULL. + </para> + </listitem> + + <listitem> + <para> + Allow libpq to support TLS versions beyond TLSv1 (Marko Kreen) + </para> + </listitem> + + <listitem> + <para> + Document that libpq's PQclientEncoding() returns -1 for an encoding lookup failure (Bruce Momjian) + </para> + </listitem> + + </itemizedlist> + + </sect3> + + <sect3> + <title>Client Applications</title> + + <itemizedlist> + + <listitem> + <para> + Add createuser -g to specify role membership (Chistopher Browne) + </para> + </listitem> + + <listitem> + <para> + Allow vacuumdb --analyze-in-stages to analyze in stages of increasing granularity (Peter Eisentraut) + </para> + + <para> + This allows minimal statistics to be created quickly. + </para> + </listitem> + + <listitem> + <para> + Allow pg_xlogdump to report a live log stream with --follow (Heikki Linnakangas) + </para> + </listitem> + + <listitem> + <para> + Have pg_resetxlog -n output current and potentially changed values (Rajeev Rastogi) + </para> + </listitem> + + <listitem> + <para> + Allow sizeof() in ecpg C array definitions (Michael Meskes) + </para> + </listitem> + + <listitem> + <para> + Have ecpg properly handle nesting requirements in C and SQL mode for C-style comments (Michael Meskes) + </para> + </listitem> + + <listitem> + <para> + Have pg_ctl return '4' for an inaccessible data directory specification (Amit Kapila, Bruce Momjian) + </para> + + <para> + This more closely matches the Linux Standard Base Core Specification. + </para> + </listitem> + + <listitem> + <para> + On Windows interpret pg_ctl -D relative directories relative to pg_ctl's current directory (Kumar Rajeev Rastogi) + </para> + </listitem> + + </itemizedlist> + + <sect4> + <title><link linkend="APP-PSQL"><application>psql</></link></title> + + <itemizedlist> + + <listitem> + <para> + Allow field wrapping to psql's "extended" mode (Sergey Muraviov) + </para> + </listitem> + + <listitem> + <para> + Suppress "No rows" in psql expanded mode when the footer is disabled (Bruce Momjian) + </para> + </listitem> + + <listitem> + <para> + Allow Control-C to abort psql hung at connection startup (Peter Eisentraut) + </para> + </listitem> + + </itemizedlist> + + <sect5> + <title><link linkend="APP-PSQL-meta-commands">Backslash Commands</link></title> + + <itemizedlist> + + <listitem> + <para> + Have psql \db+ show tablespace options (Magnus Hagander) + </para> + </listitem> + + <listitem> + <para> + Have psql \do+ display the functions which implement the operators (Marko Tiikkaja) + </para> + </listitem> + + <listitem> + <para> + Have psql \d+ output an OID line only if an oid column exists in a table (Bruce Momjian) + </para> + + <para> + Previously, the presence or absence of an oid column was always reported. + </para> + </listitem> + + <listitem> + <para> + Have \d display disabled system triggers (Bruce Momjian) + </para> + + <para> + Previously if you disabled all triggers, only user triggers would show as disabled. + </para> + </listitem> + + <listitem> + <para> + Fix psql \copy to no longer require a space between 'stdin' and a semicolon (Etsuro Fujita) + </para> + </listitem> + + <listitem> + <para> + Output the row count at the end of psql \copy just like COPY (Kumar Rajeev Rastogi) + </para> + </listitem> + + <listitem> + <para> + Fix psql \conninfo to display the server's IP address for clients that connect using 'hostaddr' (Fujii Masao) + </para> + + <para> + Previously \conninfo could not display the server's IP address in such cases. + </para> + </listitem> + + <listitem> + <para> + Mention the SSL protocol version in psql's \conninfo (Marko Kreen) + </para> + </listitem> + + <listitem> + <para> + Add psql tab completion for \pset (Pavel Stehule) + </para> + </listitem> + + <listitem> + <para> + Allow psql \pset with no arguments to show all settings (Gilles Darold) + </para> + </listitem> + + <listitem> + <para> + In psql, output the written history file name (\s) without adding an absolute path prefix (Tom Lane) + </para> + + <para> + The previous output was inconsistent. + </para> + </listitem> + + </itemizedlist> + + </sect5> + + </sect4> + + <sect4> + <title><link linkend="APP-PGDUMP"><application>pg_dump</></link></title> + + <itemizedlist> + + <listitem> + <para> + Allow pg_restore options -I, -P, -T and -n to be specified multiple times (Heikki Linnakangas) + </para> + + <para> + This allows multiple restore object to be specified. + </para> + </listitem> + + <listitem> + <para> + Add IF EXISTS clauses when removing old objects during dump and restore (Pavel Stehule) + </para> + + <para> + This suppresses errors when removing old objects. The new --if-exists option to pg_dump, pg_dumpall, and pg_restore is only + available when --clean is also specified. + </para> + </listitem> + + </itemizedlist> + + </sect4> + + <sect4> + <title>pg_basebackup</title> + + <itemizedlist> + + <listitem> + <para> + Add pg_basebackup option --xlogdir to specify the pg_xlog direction location (Haribabu Kommi) + </para> + </listitem> + + <listitem> + <para> + Allow pg_basebackup to relocate tablespaces in the backup copy (Steeve Lennmark) + </para> + + <para> + This is particularly useful for using pg_basebackup on the same machine as the primary. + </para> + </listitem> + + <listitem> + <para> + Allow network-streams base backups to be throttled (Antonin Houska) + </para> + + <para> + This can be controlled with the pg_basebackup --max-rate parameter. + </para> + </listitem> + + </itemizedlist> + + </sect4> + + </sect3> + + <sect3> + <title>Source Code</title> + + <itemizedlist> + + <listitem> + <para> + Improve the way tuples are frozen, to preserve forensic information ((Robert Haas, Andres Freund) + </para> + + <para> + Code that inspects tuple flag bits will need to be modified + </para> + </listitem> + + <listitem> + <para> + Auto-resize the catalog cache (Heikki Linnakangas) + </para> + + <para> + This reduces memory consumption for backends accessing only a few tables, and improves performance for backend accessing many + tables. + </para> + </listitem> + + <listitem> + <para> + No longer require function prototypes for function marked with the PG_FUNCTION_INFO_V1 macro (Peter Eisentraut) + </para> + + <para> + This eliminates needless boilerplate prototypes whose lack generates compiler warnings. + </para> + </listitem> + + <listitem> + <para> + Remove SnapshotNow and HeapTupleSatisfiesNow (Robert Haas) + </para> + + <para> + All existing uses have been switched to more appropriate snapshot types. + </para> + </listitem> + + <listitem> + <para> + Use an MVCC snapshot (rather than SnapshotNow) for catalog scans (Robert Haas) + </para> + </listitem> + + <listitem> + <para> + Add API for memory allocations over four gigabytes (Noah Misch) + </para> + </listitem> + + <listitem> + <para> + Add psprintf() to simplify memory allocation during string composition (Peter Eisentraut, Tom Lane) + </para> + </listitem> + + <listitem> + <para> + Use printf() modifier "z" to specify size_t values (Andres Freund) + </para> + </listitem> + + <listitem> + <para> + Change API of appendStringInfoVA() to better use vsnprintf() (David Rowley, Tom Lane) + </para> + </listitem> + + <listitem> + <para> + Allow new types of external toast datums to be created (Andres Freund) + </para> + </listitem> + + <listitem> + <para> + Add single-reader, single-writer, lightweight shared message queue (Robert Haas) + </para> + </listitem> + + <listitem> + <para> + Memory barrier changes? + </para> + </listitem> + + <listitem> + <para> + Improve spinlock speed on x86_64 CPUs (test on i386?) (Heikki Linnakangas) + </para> + </listitem> + + <listitem> + <para> + Remove spinlock support for unsupported platforms SINIX, Sun3, and NS32K (Robert Haas) + </para> + </listitem> + + <listitem> + <para> + Reduce the number of semaphores required by --disable-spinlocks (Robert Haas) + </para> + </listitem> + + <listitem> + <para> + Rewrite duplicate_oids Unix hell script in Perl (Andrew Dunstan) + </para> + </listitem> + + <listitem> + <para> + Add Test Anything Protocol (TAP) tests for client programs (Peter Eisentraut) + </para> + </listitem> + + <listitem> + <para> + Add make targets check-tests and installcheck-tests which allow per-test specification (Andrew Dunstan) + </para> + </listitem> + + <listitem> + <para> + Remove maintainer-check makefile rule (Peter Eisentraut) + </para> + + <para> + Its functionality is now done by the default build rules. + </para> + </listitem> + + <listitem> + <para> + Improve support for VPATH builds of PGXS modules (Cédric Villemain, Andrew Dunstan) + </para> + </listitem> + + <listitem> + <para> + Upgrade to Autoconf 2.69 (Peter Eisentraut) + </para> + </listitem> + + <listitem> + <para> + Add configure flag that appends custom text to the PG_VERSION string (Oskari Saarenmaa) + </para> + + <para> + This is useful for packagers building custom binaries. + </para> + </listitem> + + <listitem> + <para> + Improve DocBook XML validity (Peter Eisentraut) + </para> + </listitem> + + <listitem> + <para> + Various security and sanity fixes reported by the Coverity scanner (Stephen Frost) + </para> + </listitem> + + <listitem> + <para> + Improve valgrind error reporting (Noah Misch) + </para> + </listitem> + + <listitem> + <para> + Improve Emacs configuration file emacs.samples (Peter Eisentraut) + </para> + + <para> + Also add .dir-locals.el to the top of the source tree. + </para> + </listitem> + + <listitem> + <para> + Allow pgindent to be supplied a command-line list of typedefs (Bruce Momjian) + </para> + + <para> + pgindent is also now smarter about blank lines around preprocessor conditionals. + </para> + </listitem> + + <listitem> + <para> + Remove IRIX port (Robert Haas) + </para> + </listitem> + + <listitem> + <para> + Avoid most uses of dlltool in Cygwin and Mingw builds (Marco Atzeri, Hiroshi Inoue) + </para> + </listitem> + + </itemizedlist> + + </sect3> + + <sect3> + <title>Additional Modules</title> + + <itemizedlist> + + <listitem> + <para> + Add pg_prewarm to preload relation data into the shared buffer cache (Robert Haas) + </para> + + <para> + This is useful at server start to produce more consistent performance. + </para> + </listitem> + + <listitem> + <para> + Add UUID random number generator gen_random_uuid() to pgcrypto (Oskari Saarenmaa) + </para> + + <para> + This allows the creation of version 4 UUIDs without requiring the installation of uuid-ossp. + </para> + </listitem> + + <listitem> + <para> + Add logging of trigger execution to auto_explain (Horiguchi Kyotaro) + </para> + </listitem> + + <listitem> + <para> + Allow reporting of the pg_stat_statements's internal query hash identifier (Daniel Farina, Sameer Thakur, Peter Geoghegan) + </para> + </listitem> + + <listitem> + <para> + Have pg_stat_statements use a flat file for query text storage, allowing higher limits (Peter Geoghegan) + </para> + + <para> + Also add the ability to retrieve all pg_stat_statements information except the query text. This allows programs to reuse the query + text already retrieved by referencing queryid. + </para> + </listitem> + + <listitem> + <para> + Fix pgstattuple to not report rows from uncommitted transactions as dead (Robert Haas) + </para> + </listitem> + + <listitem> + <para> + Have pgstattuple functions use regclass-type arguments (Satoshi Nagayasu) + </para> + + <para> + While text-type arguments are still supported, they will be removed in a later major release. + </para> + </listitem> + + <listitem> + <para> + Improve consistency of pgrowlocks output to honor snapshot rules more consistently (Robert Haas) + </para> + </listitem> + + <listitem> + <para> + Improve indexing of pg_trgm values to discourage indexing whitespace (Alexander Korotkov) + </para> + </listitem> + + <listitem> + <para> + Store cube data more compactly (Stas Kelvich) + </para> + + <para> + Existing data must be dumped/restored to use the new format. The old format can still be read. + </para> + </listitem> + + <listitem> + <para> + Reduce vacuumlo client-side memory usage by using a cursor (Andrew Dunstan) + </para> + </listitem> + + <listitem> + <para> + Dramatically reduce memory consumption in pg_upgrade (Bruce Momjian) + </para> + </listitem> + + <listitem> + <para> + Pass pg_upgrade user names (-U) to analyze scripts (Bruce Momjian) + </para> + </listitem> + + </itemizedlist> + + <sect4> + <title><link linkend="pgbench"><application>pgbench</></link></title> + + <itemizedlist> + + <listitem> + <para> + Allow pgbench to process script files of any line length (Sawada Masahiko) + </para> + + <para> + The previous line limit was BUFSIZ. + </para> + </listitem> + + <listitem> + <para> + Add pg_bench option (--rate) to control the transaction rate (Fabien Coelho) + </para> + </listitem> + + <listitem> + <para> + Add --progress output option to pgbench (Fabien Coelho) + </para> + </listitem> + + <listitem> + <para> + Add long options to pgbench (Fabien Coelho) + </para> + </listitem> + + </itemizedlist> + + </sect4> + + </sect3> + + </sect2> + </sect1> |